Slowly rotating topological neutron stars: universal relations and epicyclic frequencies Victor I. Danchev, Daniela D. Doneva and Stoytcho S. Yazadjiev Eur. Phys. J. C, 80 9 (2020) 878 Published online: 22 September 2020 DOI: 10.1140/epjc/s10052-020-08473-y